Add DockerCompatAuthFile options to ...Options, and --compat-auth-file

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

Author: mtrmac

pkg/auth/auth.go

@@ -75,20 +75,25 @@ func CheckAuthFile(pathOption string) error {
 }
 
 // systemContextWithOptions returns a version of sys
-// updated with authFile and certDir values (if they are not "").
+// updated with authFile, dockerCompatAuthFile and certDir values (if they are not "").
 // NOTE: this is a shallow copy that can be used and updated, but may share
 // data with the original parameter.
-func systemContextWithOptions(sys *types.SystemContext, authFile, certDir string) *types.SystemContext {
+func systemContextWithOptions(sys *types.SystemContext, authFile, dockerCompatAuthFile, certDir string) (*types.SystemContext, error) {
 	if sys != nil {
 		sysCopy := *sys
 		sys = &sysCopy
 	} else {
 		sys = &types.SystemContext{}
 	}
 
-	if authFile != "" {
+	switch {
+	case authFile != "" && dockerCompatAuthFile != "":
+		return nil, errors.New("options for paths to the credential file and to the Docker-compatible credential file can not be set simultaneously")
+	case authFile != "":
 		sys.AuthFilePath = authFile
-	} else {
+	case dockerCompatAuthFile != "":
+		sys.DockerCompatAuthFilePath = dockerCompatAuthFile
+	default:
 		// Keep this in sync with GetDefaultAuthFile()!
 		//
 		// Note that c/image does not natively implement the REGISTRY_AUTH_FILE
@@ -100,24 +105,24 @@ func systemContextWithOptions(sys *types.SystemContext, authFile, certDir string
 			// If the Docker configuration exists in the default ~/.docker/config.json location,
 			// we DO NOT write to it; instead, we update auth.json in the default path.
 			// Only if the user explicitly sets DOCKER_CONFIG, we write to that config.json.
-			sys.AuthFilePath = filepath.Join(dockerConfig, "config.json")
+			sys.DockerCompatAuthFilePath = filepath.Join(dockerConfig, "config.json")
 		}
 	}
 	if certDir != "" {
 		sys.DockerCertPath = certDir
 	}
-	return sys
+	return sys, nil
 }
 
 // Login implements a “log in” command with the provided opts and args
 // reading the password from opts.Stdin or the options in opts.
 func Login(ctx context.Context, systemContext *types.SystemContext, opts *LoginOptions, args []string) error {
-	systemContext = systemContextWithOptions(systemContext, opts.AuthFile, opts.CertDir)
+	systemContext, err := systemContextWithOptions(systemContext, opts.AuthFile, opts.DockerCompatAuthFile, opts.CertDir)
+	if err != nil {
+		return err
+	}
 
-	var (
-		key, registry string
-		err           error
-	)
+	var key, registry string
 	switch len(args) {
 	case 0:
 		if !opts.AcceptUnspecifiedRegistry {
@@ -311,7 +316,13 @@ func Logout(systemContext *types.SystemContext, opts *LogoutOptions, args []stri
 	if err := CheckAuthFile(opts.AuthFile); err != nil {
 		return err
 	}
-	systemContext = systemContextWithOptions(systemContext, opts.AuthFile, "")
+	if err := CheckAuthFile(opts.DockerCompatAuthFile); err != nil {
+		return err
+	}
+	systemContext, err := systemContextWithOptions(systemContext, opts.AuthFile, opts.DockerCompatAuthFile, "")
+	if err != nil {
+		return err
+	}
 
 	if opts.All {
 		if len(args) != 0 {
@@ -324,10 +335,7 @@ func Logout(systemContext *types.SystemContext, opts *LogoutOptions, args []stri
 		return nil
 	}
 
-	var (
-		key, registry string
-		err           error
-	)
+	var key, registry string
 	switch len(args) {
 	case 0:
 		if !opts.AcceptUnspecifiedRegistry {

pkg/auth/cli.go

@@ -14,14 +14,15 @@ type LoginOptions struct {
 	// CLI flags managed by the FlagSet returned by GetLoginFlags
 	// Callers that use GetLoginFlags should not need to touch these values at all; callers that use
 	// other CLI frameworks should set them based on user input.
-	AuthFile           string
-	CertDir            string
-	Password           string
-	Username           string
-	StdinPassword      bool
-	GetLoginSet        bool
-	Verbose            bool // set to true for verbose output
-	AcceptRepositories bool // set to true to allow namespaces or repositories rather than just registries
+	AuthFile             string
+	DockerCompatAuthFile string
+	CertDir              string
+	Password             string
+	Username             string
+	StdinPassword        bool
+	GetLoginSet          bool
+	Verbose              bool // set to true for verbose output
+	AcceptRepositories   bool // set to true to allow namespaces or repositories rather than just registries
 	// Options caller can set
 	Stdin                     io.Reader // set to os.Stdin
 	Stdout                    io.Writer // set to os.Stdout
@@ -34,9 +35,10 @@ type LogoutOptions struct {
 	// CLI flags managed by the FlagSet returned by GetLogoutFlags
 	// Callers that use GetLogoutFlags should not need to touch these values at all; callers that use
 	// other CLI frameworks should set them based on user input.
-	AuthFile           string
-	All                bool
-	AcceptRepositories bool // set to true to allow namespaces or repositories rather than just registries
+	AuthFile             string
+	DockerCompatAuthFile string
+	All                  bool
+	AcceptRepositories   bool // set to true to allow namespaces or repositories rather than just registries
 	// Options caller can set
 	Stdout                    io.Writer // set to os.Stdout
 	AcceptUnspecifiedRegistry bool      // set to true if allows logout with unspecified registry
@@ -46,6 +48,7 @@ type LogoutOptions struct {
 func GetLoginFlags(flags *LoginOptions) *pflag.FlagSet {
 	fs := pflag.FlagSet{}
 	fs.StringVar(&flags.AuthFile, "authfile", "", "path of the authentication file. Use REGISTRY_AUTH_FILE environment variable to override")
+	fs.StringVar(&flags.DockerCompatAuthFile, "compat-auth-file", "", "path of a Docker-compatible config file to update instead")
 	fs.StringVar(&flags.CertDir, "cert-dir", "", "use certificates at the specified path to access the registry")
 	fs.StringVarP(&flags.Password, "password", "p", "", "Password for registry")
 	fs.StringVarP(&flags.Username, "username", "u", "", "Username for registry")
@@ -59,6 +62,7 @@ func GetLoginFlags(flags *LoginOptions) *pflag.FlagSet {
 func GetLoginFlagsCompletions() completion.FlagCompletions {
 	flagCompletion := completion.FlagCompletions{}
 	flagCompletion["authfile"] = completion.AutocompleteDefault
+	flagCompletion["compat-auth-file"] = completion.AutocompleteDefault
 	flagCompletion["cert-dir"] = completion.AutocompleteDefault
 	flagCompletion["password"] = completion.AutocompleteNone
 	flagCompletion["username"] = completion.AutocompleteNone
@@ -69,6 +73,7 @@ func GetLoginFlagsCompletions() completion.FlagCompletions {
 func GetLogoutFlags(flags *LogoutOptions) *pflag.FlagSet {
 	fs := pflag.FlagSet{}
 	fs.StringVar(&flags.AuthFile, "authfile", "", "path of the authentication file. Use REGISTRY_AUTH_FILE environment variable to override")
+	fs.StringVar(&flags.DockerCompatAuthFile, "compat-auth-file", "", "path of a Docker-compatible config file to update instead")
 	fs.BoolVarP(&flags.All, "all", "a", false, "Remove the cached credentials for all registries in the auth file")
 	return &fs
 }
@@ -77,5 +82,6 @@ func GetLogoutFlags(flags *LogoutOptions) *pflag.FlagSet {
 func GetLogoutFlagsCompletions() completion.FlagCompletions {
 	flagCompletion := completion.FlagCompletions{}
 	flagCompletion["authfile"] = completion.AutocompleteDefault
+	flagCompletion["compat-auth-file"] = completion.AutocompleteDefault
 	return flagCompletion
 }